How To Check Voltage Multimeter
How To Check Voltage Multimeter – So… how do I use a multimeter? This tutorial shows you how to use a digital multimeter (DMM), an important tool for diagnosing circuits, viewing other people’s electronic designs, and even testing your battery. Hence the name ‘Bahu’-‘Meter’ (multiple measurement).
The most basic things we measure are voltage and current. A multimeter is also great for some basic health checks and troubleshooting. Is your circuit not working? Does the circuit breaker work? Put a meter! A multimeter is the first line of defense when troubleshooting a system. In this tutorial we cover voltage, current, resistance and continuity measurements.
How To Check Voltage Multimeter
We will use the SparkFun VC830L for this tutorial, but these techniques apply to most multimeters.
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The display can normally show four digits and a minus sign. Many multimeters have backlit screens for better viewing in low light conditions.
The selector button allows the user to set the multimeter to read various things such as milliamps (mA) current, voltage (V) and resistance (Ω).
Two probes connect to two ports on the front of the device. COM stands for Common and is almost always connected to ground or the “-” point in a circuit. The COM probe is traditionally black, but apart from the color there is no difference between the red and black probes. 10A is the special port used when measuring high currents (above 200 mA). mAVΩ is the port to which the red probe is traditionally connected. This port allows you to measure current (up to 200 mA), voltage (V) and resistance (Ω). A. for the tests
Enter the connector that connects to the multimeter. All banana plug probes work with this meter. This makes it possible to use different types of tests.
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To start, measure the voltage of an AA battery: connect the black probe to COM, the red probe to mAVΩ. Set the multimeter to “2V” in the DC range. Almost all portable electronics use direct current, not alternating current. Connect the black probe to the battery terminal or “-” and the red probe to the power supply terminal or “+”. Clamp the probes to the positive and negative terminals of the AA battery with slight pressure. If you have a fresh battery, you should see about 1.5V on the screen (this is a brand new battery, so its voltage is slightly higher than 1.5V).
If you’re measuring a DC voltage (like a battery or a sensor connected to an Arduino), you’ll want to set the knob so that V is equal. AC voltage (like what comes out of the wall) can be dangerous, so we rarely need to use the AC voltage setting (V, with a wavy line next to it). If you mess around with AC, we recommend getting a non-contact tester instead of using a digital multimeter.
What happens if you switch the red and black probes? The multimeter reading is simply negative. Nothing bad happens! The multimeter measures the voltage relative to the common probe. What is the voltage on the battery’s ‘+’ compared to the common or negative terminal? 1.5 V If we switch probes, ‘+’ is defined as the common or zero point. What is the ‘-‘ voltage on the battery compared to the new zero? -1.5V!
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Now let’s build a simple circuit to measure voltage in real life situations. The circuit is only 1kΩ And a blue, super bright LED powered by a SparkFun Breadboard Power Supply Stick. To start, make sure the circuit you are working on is properly powered. If your project is supposed to be 5V but is below 4.5V or above 5.5V, this is a quick indication that something is wrong and you may want to check the power connections or circuit wiring.
Set the knob to “20V” in the DC range (in the DC voltage range there is a V with a line next to it). Multimeters are usually not automatic. The multimeter must be set to a measurable range. For example, 2V measures voltage up to 2V and 20V measures up to 20V. So if you are measuring a 12V battery, use the 20V setting. 5V system? Use the 20V setting. If you set it wrong, you will probably see the meter display change to ‘1’.
With some force (think of pushing a fork into a piece of cooked meat), push the probes onto two exposed pieces of metal. One of the probes must be in contact with the GND connector. A probe for VCC or 5V connection.
We can also test different parts of the circuit. This practice is called node analysis and is a fundamental building block of circuit analysis. By measuring the voltage of the circuit, we can see how much voltage each component needs. First, measure the entire circuit. If we measure where the voltage on the LED enters the resistor and ground, we can expect the total voltage in the circuit to be around 5V.
How To Check Ac Voltage With Multimeter
Then we can see how much voltage the LED uses. This is called the voltage drop of the LED. Don’t worry if it doesn’t make sense now. This will happen as you explore the electronic world more. The most important thing is to be able to measure different parts of the circuit to analyze the circuit as a whole.
This uses 2.66V from the available 5V supply to turn on the LED. This is lower than the forward voltage listed on the datasheet because there is only a small current flowing in the circuit, but it rises slightly.
What happens if you select a lower voltage setting than the voltage you want to measure? Nothing bad. The meter just shows 1. This meter is trying to indicate that you are overloaded or out of range. Whatever you try to read is too much for that setting. Try setting the multimeter knob to the next higher setting.
Why does the meter show 20V and not 10V? If you want to measure a voltage below 20V, select the 20V setting. With this you can read from 2.00 to 19.99.
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Most multimeters can only display “1” as the first number, so ranges are limited to 19.99 instead of 99.99. So 20V max range instead of 99V max range.
Attention! In general, stick to DC circuits (multimeter settings are straight lines, not curved lines). Most multimeters can measure AC (alternating current) systems, but AC circuits can be dangerous. An AC or “mains voltage” outlet can be very good for you. Handle AC with great care. Use an AC tester to see if an outlet is turned on. Of course we want to measure AC when we have an outlet acting funny (is it really 110V?) or when we’re trying to control a heating element (like a hotplate). Take it slow and double check everything before testing the AC circuit.
Common resistors are color coded. If you don’t know what they mean, that’s okay! There are plenty of easy to use online calculators. However, if you are without internet access, a multimeter is very useful for measuring resistance.
Choose a random resistor and set the multimeter to 20 kΩ. Then hold the probes against the resistance pins, the same pressure you would experience when pressing keys on a keyboard.
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Remember that most resistors have a tolerance of 5%. This means that color codes may indicate 10,000 Ohms (10 kΩ), but a 10 kΩ resistor may be 9.5 kΩ or even 10.5 kΩ due to irregularities in the manufacturing process. Don’t worry, it works well as a pull or normal resistance.
It hasn’t changed completely. Since this resistance (1KΩ) is less than 2KΩ, it is still shown on the display. However, you will notice that there is one more digit after the decimal point, which gives us a bit more resolution as we read. What about the second lowest setting?
Now, 1kΩ 200Ω above, we maxed out the meter, he says
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